//　Macintosh 　-> MacOS 
//　Windows95/98/NT/2000/XP ->　Windows 
//　UNIX ->　UNIX 
	var osName = navigator.userAgent.toUpperCase(); //OS名格納
	if(osName.indexOf("WIN") >= 0 ) {
		dirName = "css/win/"; 
	} else if(osName.indexOf("MAC") >= 0) {
		dirName = "css/mac/"; 
	} else if(osName.indexOf("X11") >= 0) {
		dirName = "css/unix/";
	} else {
		dirName = "css/win/";
	}

//　Netscape Navigator -> Netscape 
//　Internet Explorer ->　Explorer 
//　Safari ->　Safari 
//　Opera ->　Opera 
	var browser = navigator.appName.toUpperCase();
	if (browser.indexOf("MICROSOFT") >= 0) {
		dirName += "ie.css";
	} else if (browser.indexOf("NETSCAPE") >= 0) {
		dirName += "nn.css";
	} else if (browser.indexOf("SAFARI") >= 0) {
		dirName += "saf.css";
	} else if (browser.indexOf("OPERA") >= 0) {
		dirName += "op.css";
	} else {		
		dirName += "ie.css";
	}

document.write("<link rel='stylesheet' href='"+dirName+"' type='text/css'>");